Move LTTng-UST buffer ownership from application to consumer

[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c

diff --git a/src/bin/lttng-sessiond/trace-kernel.c b/src/bin/lttng-sessiond/trace-kernel.c
index e8c381aa8cbfd634a34788db30e2520a2a535a53..48be065765b2a548892bd534cea6cb0ec8c1df10 100644 (file)
--- a/src/bin/lttng-sessiond/trace-kernel.c
+++ b/src/bin/lttng-sessiond/trace-kernel.c
@@ -35,10 +35,8 @@ struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
 {
        struct ltt_kernel_channel *chan;
 
-       if (session == NULL) {
-               ERR("Undefine session");
-               goto error;
-       }
+       assert(session);
+       assert(name);
 
        DBG("Trying to find channel %s", name);
 
@@ -49,7 +47,6 @@ struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
                }
        }
 
-error:
        return NULL;
 }
 
@@ -61,10 +58,8 @@ struct ltt_kernel_event *trace_kernel_get_event_by_name(
 {
        struct ltt_kernel_event *ev;
 
-       if (channel == NULL) {
-               ERR("Undefine channel");
-               goto error;
-       }
+       assert(name);
+       assert(channel);
 
        cds_list_for_each_entry(ev, &channel->events_list.head, list) {
                if (strcmp(name, ev->event->name) == 0) {
@@ -74,7 +69,6 @@ struct ltt_kernel_event *trace_kernel_get_event_by_name(
                }
        }
 
-error:
        return NULL;
 }
 
@@ -85,7 +79,6 @@ error:
  */
 struct ltt_kernel_session *trace_kernel_create_session(char *path)
 {
-       int ret;
        struct ltt_kernel_session *lks = NULL;
 
        /* Allocate a new ltt kernel session */
@@ -116,7 +109,9 @@ struct ltt_kernel_session *trace_kernel_create_session(char *path)
         */
        lks->tmp_consumer = NULL;
 
-       if (path && strlen(path) > 0) {
+       if (*path != '\0') {
+               int ret;
+
                /* Use the default consumer output which is the tracing session path. */
                ret = snprintf(lks->consumer->dst.trace_path, PATH_MAX,
                                "%s" DEFAULT_KERNEL_TRACE_DIR, path);
@@ -148,10 +143,12 @@ alloc_error:
  * Return pointer to structure or NULL.
  */
 struct ltt_kernel_channel *trace_kernel_create_channel(
-               struct lttng_channel *chan, char *path)
+               struct lttng_channel *chan)
 {
        struct ltt_kernel_channel *lkc;
 
+       assert(chan);
+
        lkc = zmalloc(sizeof(struct ltt_kernel_channel));
        if (lkc == NULL) {
                PERROR("ltt_kernel_channel zmalloc");
@@ -190,6 +187,8 @@ struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev)
        struct ltt_kernel_event *lke;
        struct lttng_kernel_event *attr;
 
+       assert(ev);
+
        lke = zmalloc(sizeof(struct ltt_kernel_event));
        attr = zmalloc(sizeof(struct lttng_kernel_event));
        if (lke == NULL || attr == NULL) {
@@ -301,6 +300,8 @@ struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
        int ret;
        struct ltt_kernel_stream *lks;
 
+       assert(name);
+
        lks = zmalloc(sizeof(struct ltt_kernel_stream));
        if (lks == NULL) {
                PERROR("kernel stream zmalloc");
@@ -318,6 +319,7 @@ struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
        /* Init stream */
        lks->fd = -1;
        lks->state = 0;
+       lks->cpu = count;
 
        return lks;
 
@@ -330,11 +332,13 @@ error:
  */
 void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
 {
-       int ret;
+       assert(stream);
 
        DBG("[trace] Closing stream fd %d", stream->fd);
        /* Close kernel fd */
        if (stream->fd >= 0) {
+               int ret;
+
                ret = close(stream->fd);
                if (ret) {
                        PERROR("close");
@@ -351,9 +355,11 @@ void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
  */
 void trace_kernel_destroy_event(struct ltt_kernel_event *event)
 {
-       int ret;
+       assert(event);
 
        if (event->fd >= 0) {
+               int ret;
+
                DBG("[trace] Closing event fd %d", event->fd);
                /* Close kernel fd */
                ret = close(event->fd);
@@ -380,6 +386,8 @@ void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
        struct ltt_kernel_event *event, *etmp;
        int ret;
 
+       assert(channel);
+
        DBG("[trace] Closing channel fd %d", channel->fd);
        /* Close kernel fd */
        if (channel->fd >= 0) {
@@ -412,11 +420,13 @@ void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
  */
 void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
 {
-       int ret;
+       assert(metadata);
 
        DBG("[trace] Closing metadata fd %d", metadata->fd);
        /* Close kernel fd */
        if (metadata->fd >= 0) {
+               int ret;
+
                ret = close(metadata->fd);
                if (ret) {
                        PERROR("close");
@@ -435,6 +445,8 @@ void trace_kernel_destroy_session(struct ltt_kernel_session *session)
        struct ltt_kernel_channel *channel, *ctmp;
        int ret;
 
+       assert(session);
+
        DBG("[trace] Closing session fd %d", session->fd);
        /* Close kernel fds */
        if (session->fd >= 0) {